func NewBackServices(poller *zmq.Poller, productName string, topo *zk.Topology) *BackServices {
// 创建BackServices
result := &BackServices{
Services: make(map[string]*BackService),
OfflineServices: make(map[string]*BackService),
poller: poller,
topo: topo,
}
var evtbus chan interface{} = make(chan interface{}, 2)
servicesPath := topo.ProductServicesPath()
path, e1 := topo.CreateDir(servicesPath) // 保证Service目录存在，否则会报错
fmt.Println("Path: ", path, "error: ", e1)
services, err := topo.WatchChildren(servicesPath, evtbus)
if err != nil {
log.Println("Error: ", err)
// TODO: 这个地方需要优化
panic("Reading Service List Failed")
}
go func() {
for true {
result.Lock()
for _, service := range services {
log.Println("Service: ", service)
if _, ok := result.Services[service]; !ok {
result.addBackService(service)
}
}
result.Unlock()
// 等待事件
<-evtbus
// 读取数据，继续监听(连接过期了就过期了，再次Watch即可)
services, err = topo.WatchChildren(servicesPath, evtbus)
}
}()
// 读取zk, 等待
log.Println("ProductName: ", result.topo.ProductName)
return result
}
